nim·bus, n. pl. nim·bi (- or nim·bus·es1) A cloudy radiance said to surround a classical deity when on earth. 2) A radiant light that appears usually in the form of a circle or halo about or over the head in the representation of a god, demigod, saint, or sacred person such as a king or an emperor. 3) A splendid atmosphere or aura, as of glamour, that surrounds a person or thing. 4) Also a Danish built motorcycle.

I fixed the problem !The memory of my grapical card was much to low when I looked in BIOS, so I changed it, there was only 8 mb memory reserved for it (don't know how this comes). Now it's 128 and I don't have the problems now !!!

nim·bus, n. pl. nim·bi (- or nim·bus·es1) A cloudy radiance said to surround a classical deity when on earth. 2) A radiant light that appears usually in the form of a circle or halo about or over the head in the representation of a god, demigod, saint, or sacred person such as a king or an emperor. 3) A splendid atmosphere or aura, as of glamour, that surrounds a person or thing. 4) Also a Danish built motorcycle.